Also thematically related is The Twisted Ones by T Kingfisher, which itself is a reinterpretation of The White Ones by Arthur Machen (written in the late 1890s). Appalachia has been creeping people out for a long time!
As I mentioned in another comment, but elaborating further here, there's a Savage World's setting that revolves around eldritch horror and rampant corporate industry called Holler.